Determination of local temperatures and albedo gradient in the zodiacal cloud from IRAS radiometric data

Details Determination of local temperatures and albedo gradient in the zodiacal cloud from IRAS radiometric data Determination of local temperatures and albedo gradient in the zodiacal cloud from IRAS radiometric data

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985crasb.300..109l&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre

Astronomy and Astrophysics

Astronomy

2

Albedo, Infrared Astronomy Satellite, Interplanetary Dust, Space Temperature, Thermal Emission, Zodiacal Light, Absorption Spectroscopy, Polarimetry, Solar System, Spectrophotometry, Spectroradiometers

Scientific paper

The method of nodes of lesser uncertainty, which permits in photopolarimetry of zodiacal light, the localization of two values from information integrated on the line of sight, is extended to radiometry and applied to IRAS satellite measurements of interplanetary thermal emissions. It is shown that the thermal emission intensities and temperatures (260 + or - 25 K and 212 + or - 10 K) are obtained at 1 and 1.5 AU, respectively, from the sun, with a notable regression of the uncertainty and of the model dependence with respect to the temperatures averaged along the line of sight. A decrease of 1/r of the space number density is found to be more probable than the rapid decrease generally accepted. It is concluded that the absorption factor of the interplanetary dust increases between the earth's orbit and that of Mars, and that the optical properties for an elementary volume, and consequently the composition of the particles that it contains, depend on the distance to the sun, this is particularly true for the albedo which decreases from the earth to Mars.

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